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arXiv 1901.07772hep-ph
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使用Kimber-Martin-Ryskin未积分部分子分布函数的$k_t$因子化框架中的$^4He$、$^3He$和$^3H$核的EMC比率

The EMC ratios of $^4He$, $^3He$ and $^3H$ nuclei in the $k_t$ factorization framework using the Kimber-Martin-Ryskin unintegrated parton distribution functions

M. Modarres, H. Hadian

摘要:

用$k_t$ -因子化方法计算了$^3H$、$^3He$和$^4He$核的未积分部分子分布函数。利用Kimber-Martin-Ryskin(KMR)公式,从组分夸克交换模型(CQEM)得到的单标度部分子分布函数(PDF)计算了这些核的双标度质量分数。然后,这些SF被用来计算这些核的欧洲μ子合作(EMC)比率。所得的EMC比,然后与现有的实验数据进行比较,并取得了良好的一致性与数据。与我们以前的EMC比率相比,在计算中使用传统的PDF,目前的结果与实验在小$x$区域的一致性变得令人印象深刻。因此,可以得出结论,部分子的$k_t$依赖性可以再现上述核中小$x$值时阴影效应的一般形式。

英文摘要:

The unintegrated parton distribution functions (UPDFs) of $^3H$, $^3He$ and $^4He$ nuclei are generated to calculate their structure functions (SFs) in the $k_t$-factorization approach. The Kimber-Martin-Ryskin (KMR) formalisn is applied to evaluate the double-scale UPDFs of these nuclei from their single-scale parton distribution functions (PDFs), which can be obtained from the constituent quark exchange model (CQEM). Afterwards, these SFs are used to calculate the European Muon Collaboration (EMC) ratios of these nuclei. The resulting EMC ratios are then compared with the available experimental data and good agreement with data is achieved. In comparison with our previous EMC ratios, in which the conventional PDFs were used in the calculations, the accord of the present outcomes with experiment at the small $x$ region becomes impressive. Therefore, it can be concluded that the $k_t$ dependence of partons can reproduce the general form of the shadowing effect at the small $x$ values in above nuclei.

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